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Hall, E. R. and K. R. Kelson. 1952. The subspecific status of two Central American sloths. University of Kansas Publications, Museum of Natural History, 5(24): 313-317.

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Harkness, H. W. 1882. Footprints found at the Carson State Prison. Proceedings of the California Academy of Science, ???.

Hausman, L. A. 1936. Further studies of the hair of the fossil ground sloth (Nothrotherium shastense) and of its problematical "ovate bodies". American Journal of Science, 31: 223-228.

Hauthal, R. 1899. Resena de los hallazgos en las Cavernas de Ultima Esperanza. Revista del Museo de La Plata, 9: 409-420.

Hauthal, R., S. Roth, and R. Lehmann-Nitsche. 1899. El Mamifero misterioso de la Patagonia "Grypotherium domesticum". Revista del Museo de La Plata, 9: 1-65.

Hay, O. P. 1916. Description of two extinct Mammals of the order Xenarthra from the Pleistocene of Texas. Proceedings of the United States National Museum, 51: 107-123.

-------- 1919. Descriptions of some mammalian and fish remains from Florida of probably Pleistocene age. Proceedings of the United States National Museum, 56: 103-112. (type description, Thinobadistes segnis)

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Herbig-Sandreuther, A. 1964. Neue Beobachtungen am venezolanischen Dreizehenfaultier, Bradypus infuscatus flaccidus, Gray (1849). Acta Tropica, 21: 97-113.

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-------- 1985. Ground sloths from the Friasian La Venta fauna, with additions to the Pre-Friasian Coyaima fauna of Colombia, South America. University of California Publications in Geological Science, 128: 1-91. (type description, Pseudoprepotherium confusum)

Hirschfeld, S. E. and S. D. Webb. 1968. Plio-Pleistocene megalonychid sloths of North America. Bulletin of the Florida State Museum Biological Sciences, 12(5): 213-296. (type description, Megalonyx mathisi & Pliometanstes protistus)

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-------- 1956. Contribution á l'étude des Orophodontoidea gravigrades cuirassés de la Patagonie. Annales Paléontologie, 42: 25-64.

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-------- 1961. Description d'un squelette de Planops (gravigrade du Miocene de Patagonia). Mammalia, 25(1): 57-96. (type description, Pseudoprepotherium)

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-------- 1982. Les Édentés Xénarthres, un groupe singulier de la faune néotropicale. Paleontology, Essential of Historical Geology (Proceedings of the First International Meeting of Paleontology, Venice 1981): 385-443.

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Holman, J. A., and C. J. Clausen. 1984. Fossil vertebrates associated with Paleo-Indian artifact at Little Salt Spring, Florida. Journal of Vertebrate Paleontology, 4(1): 146-154.

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