LC Classification QE369

21st century (11) Africa (5) American (33) analysis (6) antique (47) archaeology (16) art (47) bibliography (8) biology (8) California (18) Canada (15) caves (8) chemistry (64) children (20) children's (24) classic (12) diamond (9) dictionary (17) digital (8) earth (49) ecology (10) education (8) educational (10) environment (11) general science (5) geography (30) geology (1,847) gold (10) Great Britain (6) guide (109) guidebook (89) handbook (14) healing (9) hiking (6) historical (16) history (71) horror (6) informational (7) insects (6) instructional (6) juvenile (14) kids (15) local (5) magic (5) maps (30) Mexico (6) Michigan (6) mining (42) Minnesota (5) natural resources (8) natural science (24) natural world (10) nature (332) New Jersey (7) New Mexico (18) North America (15) outdoors (5) photographs (48) photography (10) picture book (18) reference (535) references (13) regional (96) rock (51) Russia (6) school (8) science (996) Science & Technology (7) science nonfiction (5) Southwest (6) spirituality (8) stone (14) stones (72) systems (5) travel (78) US (10) USA (39) volcanoes (10) Washington (13) Wyoming (6) youth (6)