| Grotto Name |
Serial |
| Aggie Speleological Society |
000263 |
| Anthros Costa Rica Grotto |
000420 |
| Arbuckle Mountains Grotto |
000463 |
| Armpit Grotto |
000228 |
| Athens Speleological Society |
000232 |
| Augusta Cave Masters |
000404 |
| Bald Eagle Grotto |
000320 |
| Balincaguin Conservancy Grotto |
000467 |
| Baltimore Grotto |
000040 |
| Battlefield Area Troglodyte Soc BATS |
000395 |
| Bexar Grotto |
000304 |
| Birmingham Grotto |
000083 |
| Bloomington IN Grotto |
000080 |
| Blue Grass Grotto |
000111 |
| Blue Ridge Grotto |
000180 |
| Boston Grotto |
000035 |
| Boston Mountain Grotto |
000219 |
| Branson Area Tri-Lakes Grotto |
000441 |
| Bucks County Grotto |
000272 |
| Cascade Grotto |
000026 |
| Cave Hill Grotto |
000464 |
| Central Alabama Grotto |
000387 |
| Central Arizona Grotto |
000106 |
| Central Connecticut Grotto |
000093 |
| Central Florida Grotto |
000375 |
| Central Indiana Grotto |
000060 |
| Central New Jersey Grotto |
000252 |
| Central Ohio Grotto |
000042 |
| Central Oklahoma Grotto |
000152 |
| Central Region Arkansas Grotto |
000448 |
| Charleston Grotto |
000006 |
| Charlottesville Grotto |
000020 |
| Chattanooga Grotto |
000067 |
| Chouteau Grotto |
000091 |
| Clayton County Cavers |
000285 |
| Cleveland Grotto |
000005 |
| Clock Tower Grotto |
000416 |
| COBRA Grotto |
000465 |
| Cochise County Cavers |
000407 |
| Colorado Grotto |
000033 |
| Colorado Western Slope Grotto |
000459 |
| Commander Cody Caving Club |
000235 |
| Crescent City Cavers |
000419 |
| Cullman Grotto |
000392 |
| Daedalus Cavers Grotto |
000477 |
| Dallas-Fort Worth Grotto |
000076 |
| Dayton Underground Grotto |
000366 |
| Desert Dog Troglodytes |
000409 |
| Detroit Urban Grotto |
000293 |
| Devilstep Grotto |
000469 |
| Diablo Grotto |
000148 |
| District of Columbia Grotto |
000002 |
| Dogwood City Grotto |
000116 |
| East Tennessee Grotto |
000069 |
| Eastern Indiana Grotto |
000337 |
| Escabrosa Grotto |
000189 |
| ESSO Grotto |
000178 |
| Evansville Metropolitan Gr. |
000021 |
| Fairfax Underground Network |
000338 |
| Flint River Grotto |
000382 |
| Flittermouse Grotto |
000193 |
| Florida Speleological Society |
000068 |
| Fort Knox Grotto |
000264 |
| Franklin County Grotto |
000283 |
| Frederick Grotto |
000226 |
| Front Range Grotto |
000105 |
| Front Royal Grotto |
000361 |
| Gadsden Grotto |
000267 |
| Gem State Grotto |
000140 |
| Germany Valley Grotto |
000229 |
| Glacier Grotto |
000254 |
| Greater Allentown Grotto |
000273 |
| Greater Cincinnati Grotto |
000110 |
| Greater Houston Grotto |
000146 |
| Greater Randoph (G.R.O.S.S.) |
000282 |
| Great Lakes Cavers |
000452 |
| Green River Grotto |
000256 |
| Greenbrier Grotto |
000191 |
| Guad Grotto |
000479 |
| Gypsy Underground Grotto |
000429 |
| Hart of Kentucky
Grotto |
000422 |
| Hawaii Grotto |
000356 |
| Helderberg-Hudson Grotto |
000318 |
| Hole-in-the-Wall Grotto |
000233 |
| Huntingdon County Cave Hunters |
000314 |
| Huntsville Grotto |
000063 |
| Iowa Grotto |
000019 |
| Jackson County Grotto |
000423 |
| Jackson Underground Soc (JUST) |
000412 |
| James River Grotto |
000343 |
| Kansas City Area Grotto |
000165 |
| Kansas Speleological Society |
000303 |
| Little Egypt Grotto |
000129 |
| Little Rock Grotto |
000342 |
| Louisville Grotto |
000131 |
| Loyalhanna Grotto |
000327 |
| Lubbock Area Grotto |
000317 |
| Madison University Stu
Gr |
000266 |
| Meramec Valley Grotto |
000184 |
| Mesilla Valley Grotto |
000195 |
| Met Grotto |
000017 |
| Miami Valley Grotto |
000237 |
| Michigan Interlakes Grotto |
000168 |
| Middle Georgia Grotto |
000378 |
| Middle Mississippi Valley Gr. |
000082 |
| Middle Ozark Lower Earth Soc |
000286 |
| Minnesota Caving Club |
000471 |
| Minnesota Speleological Survey |
000298 |
| Missouri Sch Mines Spelunkers Club |
000048 |
| Monongahela Grotto |
000124 |
| Monroe County Cavers |
000355 |
| Montgomery Grotto |
000297 |
| Mother Lode Grotto |
000114 |
| Mountain Empire Grotto |
000234 |
| Mountain State Grotto |
000199 |
| Mule Mountain Caving Club |
000335 |
| Nashville Grotto |
000049 |
| Near Normal Grotto |
000363 |
| New Jersey Tri-State Spel. Soc |
000436 |
| New Mexico Tech Student Grotto |
000453 |
| New River Valley Grotto |
000224 |
| Niagara Frontier Grotto |
000188 |
| Nittany Grotto |
000014 |
| Northern Arizona Grotto |
000411 |
| Northern Colorado Grotto |
000163 |
| Northern Indiana Grotto |
000200 |
| Northern Nevada Grotto |
000457 |
| Northern New Jersey Grotto |
000037 |
| Northern Rocky Mountain Grotto |
000428 |
| Ohio Cavers and Climbers |
000417 |
| Oregon Grotto |
000123 |
| Oregon High Desert Grotto |
000346 |
| Ozark Highlands Grotto |
000230 |
| PAAMUL, Gruta de |
000425 |
| Paha Sapa Grotto |
000064 |
| Pajarito Grotto |
000339 |
| Parkersburg Area Grotto |
000135 |
| Pecos Valley Grotto |
000089 |
| Pennsylvaina Inner Earth Grotto |
000444 |
| Permian Basin Speleological So |
000300 |
| Philadelphia Grotto |
000008 |
| Pigeon Mountain Grotto |
000369 |
| Pine Mountain Grotto |
000380 |
| Pittsburgh Grotto |
000011 |
| Redwood Grotto |
000473 |
| Rensselaer Outing Club |
000015 |
| Richmond Area Spel. Soc. |
000004 |
| River City Grotto |
000472 |
| Rockcastle Regional Grotto |
000462 |
| Rock River Speleological Society |
000144 |
| Roubidoux Grotto |
000478 |
| Saint Joseph Valley
Grotto |
000413 |
| Salt Lake Grotto |
000041 |
| San Diego Grotto |
000205 |
| San Francisco Bay Chap NSS |
000079 |
| San Joaquin Valley Grotto |
000062 |
| Sandia Grotto |
000088 |
| SEMO Grotto |
000107 |
| Seven Valleys Grotto |
000426 |
| Sewanee Mountain Grotto |
000379 |
| Shascade Caving Society |
000386 |
| Shasta Area Grotto |
000289 |
| Shawangunk-Catskill Area Grotto |
000372 |
| Sierra Blanca Grotto |
000466 |
| Silver Sage Grotto |
000439 |
| Six Ridges Grotto |
000468 |
| Sligo Grotto |
000186 |
| Smoky Mountain Grotto |
000130 |
| South Carolina Interstate Grotto |
000359 |
| Southern Arizona |
000424 |
| Southern California Grotto |
000016 |
| Southern Colorado Mountain |
000241 |
| Southern Nevada Grotto |
000218 |
| Southport Chronic Cavers |
000402 |
| Spencer Mountain Grotto |
000403 |
| Springfield Plateau Grotto |
000455 |
| Standing Stone Grotto |
000248 |
| Stanislaus Spel. Society |
000149 |
| Stonewall Cavers |
000435 |
| Sub-Urban Chicago Grotto |
000408 |
| Syracuse University Outing |
000280 |
| Tampa Bay Area Grotto |
000295 |
| Team Poseidon |
000475 |
| Tidewater Grotto |
000187 |
| Timberline Grotto |
000323 |
| Timpanogos Grotto |
000214 |
| TRA Grotto |
000456 |
| Tri-State Grotto |
000316 |
| Triangle Troglodytes |
000345 |
| Tulsa Regional OK Grotto |
000059 |
| Upper Cumberland
Grotto |
000315 |
| UT Grotto |
000034 |
| Utah Grotto |
000470 |
| Vermont Cavers Association |
000394 |
| Virginia Highlands Grotto |
000442 |
| VPI Cave Club |
000003 |
| Walker Mountain Grotto |
000476 |
| Wasatch Grotto |
000305 |
| West Virginia Univ. Stu. Gr. |
000243 |
| Western Indiana Grotto |
000259 |
| Western Maryland Grotto |
000294 |
| White Sands Grotto |
000108 |
| Willamette Valley Grotto |
000216 |
| Windy City Grotto |
000099 |
| Wisconsin Spel. Society |
000101 |
| Wittenberg U. Spel Soc (Stu) |
000268 |
| York Grotto |
000092 |
National
Speleological Society