P.H.D. Publicity - Propositions from three advertising agents :
- Covers, Limited (July 1930). (1st sheet) Source: SMA (SMC), U1-16-246 (1125-1126)
- Consolidated National Advertising Company (March, 1936) (2nd sheet). Source: SMA (SMC), U1-16-246 (1159-1160)
- Shanghai Telephone Company (January 1937). Source: SMA (SMC), U1-16-246 (1167)
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