| Southwest Spanish Mustang Association |
| Preserving The Purest Spanish Mustangs In Existence Today |
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| Association Background |
| History of Medicine Springs Mustangs By Gilbert Jones |
| THE MUSTANG HORSE by Barbara Goodin |
| Horses of Today From the SSMA Newsletter Fall 1987. By Bryant Rickman |
| Gilbert by Kathryne Jenson White |
| Paradise by Peggy Brietzke |
| Ancestors Of The Mustangs The Earliest Ancestors Of The Mustangs By Gilbert H Jones |