| Published: | Vol. 1, no. 1 (Nov. 1961)- |
|---|---|
| Item Description: | Title from cover. |
| Physical Description: | volumes : illustrations ; 25 cm. Beginning with 1997, also available to subscribers via the World Wide Web; full-text available in PDF and CatchWord's RealPage format. |
| Publication Frequency: | Monthly, 1987- |
| ISSN: | 0020-7543 |