
- All of the 12 lodges of Area U-A became Area 12-A in 1951:
Area 12-A (as of 1951): Canaliño 90 98 127 177 225 228 249 252 291 298 304 312
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| Area 12-A (as of 1951): |
| Canaliño 90 |
| 98 |
| 127 |
| 177 |
| 225 |
| 228 |
| 249 |
| 252 |
| 291 |
| 298 |
| 304 |
| 312 |
| Area 12-B (as of 1948): |
| Stanford-Oljato 207 |
| 262 |
| 263 |
| 282 |
| 354 |
| 375 (ch: 1948) |
| 379 (ch: 1948) |
| 380 (ch: 1948-52) |
| Kowaunkamish 395 (ch: 1948) |
| Area 12-B (as of 1960): |
| 63 |
| Stanford-Oljato 207 |
| 282 |
| 375 |
| 379 |
| 466 |
| 468 |
| 533 |
| Area 12-B (as of 1971): |
| Stanford-Oljato 207 |
| 282 |
| 379 |
| 439 |
| 466 |
| 468 |
| 528 |
| 533 |
| Area 12-C (as of 1948-49): |
| 102 |
| 278 |
| 303 |
| 342 |
| 346 |
| Area 12-C (as of 1955): |
| Cabrosha |
| Kowaunkamish |
| Mayi |
| Mow-A-Toc |
| Tannu |
| Tehama |
| Area 12-D (as of 1955-56): |
| Canaliño 90 (from 12-A) |
| Chumash 304 (from 12-A) |
| Mirimichi 102 (from 12-C) |
| Yo-Se-Mite 278 (from 12-C) |
| Sumi 342 (from 12-C) |
| Area 12-D (as of 1972): |
| Chumash 304 |
| Esselen 531 |
| Mirimichi 102 |
| Sha-Cha-Quoi 548 |
| Sumi 342 |
| Yo-Se-Mite 278 |
| Area 12-E (1955-56): |
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| Area 12-E (1955-56): |
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| Area 12-F (1955-72): |
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| Area 12-G (1955-66 or later): |
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| Area 12-H (1955 ): first met in 1966 |
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