Ижил төстэй зүйлс: Fauna of the caves of Yucatan /
- The cenotes of Yucatan; a zoological and hydrographic survey /
- Faunal and archeological researches in Yucatan caves /
- The hill-caves of Yucatan; a search for evidence of man's antiquity in the caverns of Central America /
- Caves : a wonderful underground /
- Caves : a wonderful underground /
- The seven caves; archaeological explorations in the Middle East /