Impact Factor
3.71
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.
Issues for 1919-1993 have title: Science progress in the twentieth century.
Publication suspended 1973.
Also issued online.
Microfilm. v. 11 (1916)-25 (1931). 14 microfilm reels : negative ; 35 mm.
Vol. 66 (1979)19920901 Notice not published Printed on acid-free paper