CRC Handbook of Chemistry & Physics -- a ready-reference book of chemical & physical data (melting point, etc.). Newest edition online; older edition at: Ready Ref. QD 65 H3 2003
Merck Index -- an encyclopedia of chemicals, drugs, and biologicals that contains >10,000 monographs. Each monograph is a concise description of a single substance or a small group of closely related compounds. -- Newest edition ( RS 51 .M4 2013) shelved at READY Reference; older edition downstairs at: Ref. RS 51 .M4 2001