Extension circular.
| Corporate Authors: | , |
|---|---|
| Format: | Serial |
| Language: | English |
| Language Notes: | Some nos. issued also in other languages. |
| Published: |
Durham, N. H.
[publisher not identified] ;
|
| Subjects: |
| Published: | no. 1- 1911- . |
|---|---|
| Item Description: | Caption title. Some issues on 35 mm. microfilm. |
| Physical Description: | illustrations ; 24 cm. irreg. |