A quick bookmark for you: thecentraloffice.com, "A Tribute to Telephone Central Offices and the AT&T Long Lines Microwave Network of California and the Nation." Whew, that's a mouthful. The site is "dedicated to ... the visual preservation and documentation of telephone central offices (COs) in the U.S. and select countries, [and] to visually preserve and document various stations of the retired AT&T Long Lines nationwide microwave network. Where applicable this second task is extended to local telco sites used to interconnect into the aforementioned AT&T Long Lines network."
Some California/Southwest CO pages to get you started:
California page
Arizona page
Colorado page
Nevada page
New Mexico page
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