Authors: H.
- Otis, Charles Herbert 1886-
- Otis H. Kean & Co. -
- Overend, William Heysham 1851-1898
- Overstreet, H. A. (Harry Allen) 1875-1970
- Overton, John Henry 1835-1903
- Owen, H. Collinson (Harry Collinson) 1882-1956
- Page, Curtis Hidden 1870-1946
- Paget, H. M. (Henry Marriott) 1857-1936
- Palmén, Hjalmar F. -
- Palmer, Arthur H. (Arthur Hubbell) 1859-1918
- Palmer, Edward Henry 1840-1882
- Palmer, G. H. (George Henry) 1871-
- Palmer, Harold E. 1877-1949
- Pancoast, Morris Hall 1877-1963
- Paque, Oliver 1846-1908
- Pardo de Tavera, T. H. (Trinidad Hermenegildo) 1857-1925
- Pardoe, Miss (Julia) -1862
- Parker, De Witt H. (De Witt Henry) 1885-1949
- Parker, Edward Harper 1849-1926
- Parker, F. H. M. (Francis Henry Mervyn) 1873-1911
- Parker, H. (Henry) 1849-
- Parker, John Henry 1806-1884
- Parker, John H. (John Henry) 1866-1942
- Parkhurst, Harry L. V. 1876-1962
- Parry, C. Hubert H. (Charles Hubert Hastings) 1848-1918
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