The Merck Index is the definitive reference work for scientists and professionals looking for authoritative information on chemicals, drugs and biologicals.
The essential one-volume reference to evolution The Princeton Guide to Evolution is a comprehensive, concise, and authoritative reference to the major subjects and key concepts in evolutionary biology, from genes to mass extinctions.
Van Nostrand's Scientific Encyclopedia (10th ed.) by 
The Merck Index by 
The Princeton Guide to Evolution by