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Diego Sepulveda Adobe Estancia of Costa Mesa
Costa Mesa, California

History, Historic House, Historical Society, Military

Our Society has two facilities, the Diego Sepulveda Adobe (California Historical Landmark #227), and our headquarters/museum/research facility at 1870 Anaheim Street in Costa Mesa. A part of our group, the Santa Ana Army Air Base Wing, covers the Santa Ana Army Air Base which was a pre-flight school for pilots, navigators and bombardiers from 1942-1946. We have collections covering both Costa Mesa and the SAAAB, as well as exhibits for both. When corresponding, please use our P.O. Box 1764, CM, 92628 address.

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Georgia Association of Museums 2025 Conference

February 5 - 7, 2025

Milledgeville, Georgia

Small Museum Association 41st Annual Conference 2025

February 17 - 19, 2025

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2025 California Association of Museums Conference

February 18 - 22, 2025

San Fransico, California

Virginia Association of Museum's 2025 Annual Conference!

March 15 - 18, 2025

Blacksburg, Virginia

2025 Am Assoc for State and Local History Annual Conference

September 10 - 13, 2025

Cincinnati, Ohio

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