Some units were putting the "T.P. 35" or whatever the TM's tire pressure was on the units vehicles long before the WDC came out. But, the official 'git-r-done' comes from:
WDC- 174 12 June 45
and where is the 'official' list of 'official' tire pressures?
TB 31-200-7 23May1945
The low down is: