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  1. Arbor day and bird day ... October 27, 1922.
    By: Pennsylvania. - Ashley, George Hall, - Crabtree, Fred. - Finegan, Thomas Edward, - MacFarland, John Horace, - Pinchot, Gifford, - Shoemaker, Henry Wharton, - Sproul, William Cameron, - Stuart, Robert Young, - Watts, Ralph L.
    Publication info: Harrisburg,1922
    Contributed by: Library of Congress
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  2. Vegetable forcing, by Ralph L. Watts...
    By: Watts, Ralph L.
    Publication info: New York :Orange Judd company,1917.
    Contributed by: University of British Columbia Library (archive.org)
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  3. The vegetable garden,
    By: Watts, Ralph L.
    Publication info: New York,Outing publishing company,1917.
    Contributed by: Library of Congress
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  4. Vegetable growing projects,
    By: Watts, Ralph L.
    Publication info: New York,The Macmillan ocmpany,1922.
    Contributed by: Library of Congress
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