| Save | Year | Entries | |
| Nocturnal animals -- California -- Yolla Bolly Mountains : Wallace, David Rains, | c1978 | 1 | |
| Yolngu (Australian people) -- Folklore : Cawte, John | 1996 | 1 | |
| Yolngu (Australian people) -- Health and hygiene : Cawte, John | 1996 | 1 | |
| Yolngu (Australian people) -- Medicine : Cawte, John | 1996 | 1 | |
Your entry Yonge, Charlotte M. (Charlotte Mary), 1823-1901 would be here
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| Gardens -- New York (State) -- Yonkers : Seebohm, Caroline, | 2020 | 1 | |
| Botany -- France -- Yonne | 5 | ||
| Mosses -- France -- Yonne | 2 | ||
| Birds -- England -- Yorkshire : Nelson, T. H. | 1907 | 1 | |
| Botany -- England -- Yorkshire | 8 | ||
| Geology -- England -- Yorkshire, East : Sheppard, Thomas | 19-- | 1 | |
| Yorkshire (England) -- Description and travel | 2 | ||
| Fungi -- England -- Yorkshire | 2 | ||
| Geology -- England -- Yorkshire | 3 | ||
| Moors and heaths -- England -- Yorkshire : Elgee, Frank | 1912 | 1 | |
| Natural history -- England -- Yorkshire | 2 | ||
| Paleontology -- England -- Yorkshire : Phillips, John, | 1836 | 1 | |
| Yorkshire Philosophical Society. Herbarium : Wilkinson, Henry John | 1916? | 1 | |
| Botany -- California -- Yosemite National Park : Hall, Harvey Monroe, | 1912 | 1 | |
| Yosemite National Park (Calif.) | 2 | ||
| Yosemite National Park (Calif.) -- Botany : Hall, Harvey Monroe, | 1912 | 1 | |
| Yosemite National Park (Calif.) -- Environmental conditions : Tweed, William C | c2010 | 1 | |
| Yosemite National Park (Calif.) -- History : Drabelle, Dennis, | 2021 | 1 | |
| Yosemite National Park (Calif.) -- Management : Runte, Alfred, | 2020 | 1 | |
| Ferns -- California -- Yosemite National Park : Hall, Harvey Monroe, | 1912 | 1 | |
| Natural history -- California -- Yosemite National Park : Runte, Alfred, | 2020 | 1 | |
| Natural resources -- California -- Yosemite National Park : Runte, Alfred, | 2020 | 1 | |
| Nature conservation -- California -- Yosemite National Park : Runte, Alfred, | 2020 | 1 | |
| Trees -- California -- Yosemite National Park | 2 | ||
| Wild flowers -- California -- Yosemite National Park : Wilson, Lynn | c1987 | 1 | |
| Yosemite Valley (Calif.) -- Bibliography : Farquhar, Francis P. | 1948 | 1 | |
| Yosemite Valley (Calif.) -- Description and travel : Geological Survey of California | 1868 | 1 | |
| Yosemite Valley (Calif.) -- Pictorial works : Geological Survey of California | 1868 | 1 | |
| Yoshino cherry -- See Japanese flowering cherry | 1 | ||
| Young adults -- See also Young women | 1 | ||
| Young man's guide, Author of, 1798-1859 -- See Alcott, William A. (William Andrus), 1798-1859 | 1 | ||
| Young men -- See also Boys | 1 | ||
| Young men : Stall, Sylvanus, | c1897 | 1 | |
| Young men -- Fiction : Conrad, Joseph, | 1924 | 1 | |
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Young people -- See Youth --subdivision Childhood and youth under names of individual persons; also subdivision Youth under individual wars, e.g. World War, 1939-1945--Youth |
1 | ||
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Young persons -- See Youth --subdivision Childhood and youth under names of individual persons; also subdivision Youth under individual wars, e.g. World War, 1939-1945--Youth |
1 | ||
| Young, Thomas, 1773-1829 : Wood, Alexander, | 1954 | 1 | |
| Young, Vanessa -- Death and burial : Young, Terence H | c2009 | 1 | |
| Young wife, Author of, 1798-1859 -- See Alcott, William A. (William Andrus), 1798-1859 | 1 | ||
| Young women | 3 | ||
| Young women -- Conduct of life : Lowry, E. B. | 1918 | 1 | |
| Young women -- Fiction | 2 | ||
| Youngishness -- See Youthfulness | 1 | ||
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Young's modulus -- See Elasticity --subdivision Elastic properties under individual materials and types of materials, e.g. Metals--Elastic properties |
1 | ||
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Youngsters -- See Youth --subdivision Childhood and youth under names of individual persons; also subdivision Youth under individual wars, e.g. World War, 1939-1945--Youth |
1 | ||
| Parks -- Ohio -- Youngstown : Rogers, Volney | 1904 | 1 | |