| Save | Year | Entries | |
| Patterson, John Henry, 1844-1922 : Conover, Charlotte Reeve, | 1939 | 1 | |
| Patterson, Robert, 1753-1827 : Conover, Charlotte Reeve, | 1939 | 1 | |
| Pau d'arco -- Therapeutic use | 2 | ||
| Paul, the Apostle, Saint -- Theology : Stanley, Christopher D., | 2023 | 1 | |
Your entry Paula, Saint, 347-404 would be here
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| Pauling, Linus, 1901-1994 : Goertzel, Ted George | c1995 | 1 | |
| Botanical gardens -- Italy -- Pavia : Nocca, Domenico, | 1818 | 1 | |
| Pavilions : Wilber, Donald Newton | 1962 | 1 | |
| Pavilions -- Iran -- History : Gharipour, Mohammad | 2013 | 1 | |
| Pavón, José, 1754-1840 : Steele, Arthur Robert | 1964 | 1 | |
| Pavonia -- Classification : Fryxell, Paul A | 1999 | 1 | |
| Pavonia -- Latin America -- Classification : Fryxell, Paul A | 1999 | 1 | |
| Pavonia -- Tropics -- Classification : Fryxell, Paul A | 1999 | 1 | |
| Pawpaw : Cothron, Blake, | 2021 | 1 | |
| Pawpaw -- Marketing : Cothron, Blake, | 2021 | 1 | |
| Pawpaw (Papaya) -- See Papaya | 1 | ||
| Pawpaw -- United States : Moore, Andrew, | 2015 | 1 | |
| Pawpaw -- United States -- History : Moore, Andrew, | 2015 | 1 | |
| Paxton, Joseph, Sir, 1803-1865 | 2 | ||
| Payer, Julius, 1842-1915 : Müller, Martin, | 1956 | 1 | |
| PDRI -- See Indonesia | 1 | ||
| Pea -- See Peas | 1 | ||
| Pea, Angola -- See Pigeon pea | 1 | ||
| Pea, Blackeyed -- See Cowpea | 1 | ||
| Pea, Cajan -- See Pigeon pea | 1 | ||
| Pea, Catjang -- See Pigeon pea | 1 | ||
| Pea, Congo -- See Pigeon pea | 1 | ||
| Pea, Cornfield -- See Cowpea | 1 | ||
| Pea family (Plants) -- See Legumes | 1 | ||
| Pea leaf weevil -- See Sitona lineata | 1 | ||
| Pea, No-eye -- See Pigeon pea | 1 | ||
| Pea, Pigeon -- See Pigeon pea | 1 | ||
| Pea, Southern -- See Cowpea | 1 | ||
| Peabody Museum of Salem : Morse, Albert P. | 1918 | 1 | |
| Peach | 8 | ||
| Peach -- Health aspects | 2016 | 1 | |
| Peach leaf-curl : Pierce, Newton Barris, | 1900 | 1 | |
| Peach -- Nutrition | 2016 | 1 | |
| Peacock Dahlia Farms : Peacock Dahlia Farms | 1930 | 1 | |
| Peacock (U.S. Ship) : Poesch, Jessie J | 1961 | 1 | |
| Ecology -- England -- Peak District : Anderson, Penny, | 2021 | 1 | |
| Geology -- England -- Peak District : Anderson, Penny, | 2021 | 1 | |
| Natural history -- England -- Peak District : Anderson, Penny, | 2021 | 1 | |
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Peaks -- See Mountains --headings beginning with the words Hill or Mountain |
1 | ||
| Peale, Titian Ramsay, 1799-1885 : Poesch, Jessie J | 1961 | 1 | |
| Peanut industry : Roper, William N. | c1905 | 1 | |
| Peanuts | 2 | ||
| Peanuts -- Africa, French-speaking West : Adam, Jean | 1908- | 1 | |
| Peanuts -- Diseases and pests | c1984 | 1 | |
| Pear -- See Pears | 1 | ||
| Pear, Alligator -- See Avocado | 1 | ||