Think of all the letters that went back and forth over months to get the details of a safari worked out.
I remember the old airmail stationary that folded up to make an envelope with a preprinted stamp to keep the weight down. Tanzanias was different but something like this example.
It was a big deal to get an airmail letter. We would normally go to town once a week. The post office was always part of the trip. I can still remember the old P.O Box number.
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When you think about the time lags, it's incredible anything got done! Consider Charles Cottar was running safaris in Vietnam!
Here is some of that self-envelope letter paper from Ker Downey and Selby Safaris: