Lassie: Forbidden Valley
| Illustrator | Harry L. Timmins |
| Publisher | Whitman Publishing Co. |
| Copyright Holder | Lassie Programs, Inc. |
| Format | Hardback |
| Language | English |
| Copyright | 1959 |
| Notes | Authorized Edition |
Added by disneyfacts · Last edited by Anaideia
| Illustrator | Harry L. Timmins |
| Publisher | Whitman Publishing Co. |
| Copyright Holder | Lassie Programs, Inc. |
| Format | Hardback |
| Language | English |
| Copyright | 1959 |
| Notes | Authorized Edition |