Hi Ashley:
Good Luck. TPC's have been out of production since the early 1980s - I remember using them whilst flying in Angola in the late 1980s, and we had trouble getting paper replacements for them at that time.
Your best bet might be to try and contact map stores or antique book dealers in Nepal or Tibet, with the hope that they might have an old one in stock. Or, perhaps look around to see if there is a specialist aviation supply house in your region that might have a dusty copy in the archives somewhere.
Michael
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