Impact Factor
4.50
Estimated influence, citation density, publishing volume, and citation integrity from the analytics table.
Volume, recency, access pattern, and citing-community signals from the journal analytics record.
Recent article records with DOI-first linking and condensed abstracts.
Also issued online.
Microfilm. v. 1 (1947)-10 (1956). 3 microfilm reels : negative ; 35 mm.
Vol. 31 (OCTOBER 1977)19890816 Notice published Printed on acid-free paper that meets the full ANSI standard for Permanent Paper