Authors: P
- Ashwell, Lena 1872-1957
- Ashwell, Pauline 1928-2015
- Ashworth, Henry 1871-1903
- Assmuss, Eduard Philibert 1838-1882
- Association for Promoting the Discovery of the Interior Parts of Africa -
- Astronomical Society of the Pacific -
- Athanasius, Saint, Patriarch of Alexandria -373
- Atkinson, William Patterson 1869-1943
- Atkinson, William Walker 1862-1932
- Atlas Portland Cement Company -
- Atterbury, Anson Phelps 1854-1931
- Atwater, Emily Paret 1873-1951
- Aubert de Gaspé, Philippe 1786-1871
- Aubert de Gaspé, Philippe 1814-1841
- Audibert, P. Raymond (Paul Raymond) 1858-1919
- Auguis, P. R. (Pierre René) 1786-1846
- Augusti, Brigitte 1839-1930
- Aurén, Petter Wilhelm 1826-1896
- Austin, Oscar P. (Oscar Phelps) -1933
- Australia. Queensland. Department of Ports and Harbours -
- Author of the Observant pedestrian, Montrose, Mystic cottager, &c. &c. -
- Avezac, M. d' (Marie Armand Pascal) 1800-1875
- Avril, Paul 1849-1928
- Axiotes, Pan. (Panagiotes) 1840-1918
- Ayres, Leonard Porter 1879-1946
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