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- Padilla, Mexico (1)
- Padre Island, Texas (10)
- Panoramic photographs--Texas (500)
- Panoramic photographs (502)
- Parades & processions--Mexico--Matamoros (16)
- Parades & processions--Texas (102)
- Parades & processions (120)
- Parker, James, 1854- (11)
- Parks--Texas--Brownsville (17)
- Parks--Texas (31)
- Pershing, John J. (John Joseph), 1860-1948 (2)
- Pharr, Texas (3)
- Photographs (5000)
- Piers & wharves (27)
- Point Isabel, Texas (95)
- Political posters (1)
- Port Isabel, Texas (2)
- Portrait photographs--Texas (2906)
- Portrait portraits--Texas (1)
- Portraits--Children--Texas (249)
- Portraits--Children (250)
- Portraits--Families--Texas (12)
- Portraits--Infants--Texas (130)
- Portraits--Men--Texas (351)
- Portraits--Mothers and children--Texas (10)
- Portraits--Women--Texas (458)
- Portraits--Women (460)
- Postcards (3)
- Prohibition (4)