| 其他書名 | A Guide to Trail Markers Placed by Trails West, Inc. Along the California, Applegate, Lassen, and Nobles' Emigrant Trails in Idaho, Nevada, and California |
| 出版 | Trails West, 1991 |
| URL | http://books.google.com.hk/books?id=CPF5AAAAMAAJ&hl=&source=gbs_api |