| Argitaratua: | -v. 68, no. 10 (Oct. 1991). Began in Jan. 1919. |
|---|---|
| Deskribapen fisikoa: | 68 v. : ill. ; 23-28 cm. Available on microfilm and microfiche from University Microfilms International. |
| Argitaratze maiztasuna: | Monthly, 1985- |
| ISSN: | 0031-5702 1059-6038 |