Descript |
illustrations |
Frequency |
Weekly, 2004- |
|
Monthly, 1915-1981 |
|
Semimonthly, 1982-1993 |
|
Biweekly, 1994-2003 |
Pub Date |
Began with vol. 1, no. 1 (Jan. 15, 1915). |
Note |
Vols. for 1980-1984 issued in two parts: Biological sciences, and, Physical sciences. |
|
Some issues accompanied by supplements with distinctive titles. |
ISSN |
0027-8424 |
|
1091-6490 |
|