26 A
ANALYTICAL
COLLECTIVE NUMERICAL PATENT INDEX to Volumes 3 1 - 4 0 of
CHEMICAL ABSTRACTS • Contains more than 143,000 entries; classified by coun tries in numerical order.
• Index references give vol ume, page and location of p a t e n t a b s t r a c t in C H E M I C A L ABSTRACTS.
• Classification by patent number is an enormous timesaver. • C l o t h bound, 182 pages, Vh" χ 10" o v e r a l l , 8 col umns of listings per page covering all patents ab s t r a c t e d in C H E M I C A L AB STRACTS f r o m 1937-46, inclusive.
PRICE $6.50 POSTPAID Send orders and inquiries to:
Special Publications Dept., American Chemical Society 1155 Sixteenth St., N.W., Washington 6, D. C.
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