Kevin P. Jansen, Adam P. Summers, Pablo R. Delis, Spadefoot Toads (Scaphiopus holbrookii holbrookii) in an Urban Landscape: Effects of Nonnatural Substrates on Burrowing in Adults and Juveniles, Journal of Herpetology, Vol. 35, No. 1 (Mar., 2001), pp. 141-145
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