@booklet {6775,
	title = {Permskaya sistema},
	howpublished = {Atlas rukovodiashchikh form iskopaemykh faun SSSR},
	volume = {6},
	year = {1939},
	note = {xeroxIn RussianHave 134-5,258-9, pl.31},
	pages = {??},
	publisher = {GONTI NKTP SSSR},
	address = {Leningrad, Moskva},
	keywords = {bivalvia, mollusca, oxitoma, oxitomidae, paleontology, permian, pseudomonotidae, pseudomonotis, Pteria, pteriidae, pterioida, pterioidea},
	author = {Likharev, B.}
}
@booklet {1337,
	title = {Permskaya sistema},
	howpublished = {Atlas rukovodiashchikh form iskopaemykh faun SSSR},
	volume = {6},
	year = {1939},
	publisher = {GONTI NKTP SSSR},
	address = {Leningrad, Moskva},
	keywords = {bivalvia, mollusca, oxitoma, oxitomidae, paleontology, permian, pseudomonotidae, pseudomonotis, Pteria, pteriidae, pterioida, pterioidea},
	author = {Likharev, B.}
}
