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Author

John B. Gratzek

3 books found

Cover of Aquariology

Aquariology

John B. Gratzek · First published 1992 · Latest edition 1994

Cover of Fish breeding and genetics

Fish breeding and genetics

John B. Gratzek, Paul V. Loiselle, Joanne Norton · First published 1992

Cover of Fish Diseases & Water Chemistry

Fish Diseases & Water Chemistry

John B. Gratzek · First published 1991