Here is another gem I ran across a couple of years ago while doing research. This is an audio interview of a funeral director named Joe Moore done as part of the "Voices of Oklahoma" historical project. I believe Moore died in 2011, but he talks about operating the funeral home and ambulance service during his tenure with his family's funeral operation in Oklahoma. Good stuff-first hand account. It's worth a listen.
http://www.voicesofoklahoma.com/joe_moore.html
http://www.voicesofoklahoma.com/joe_moore.html