Ackerman, Lowell J. Dr. Ackerman's book of the Labrador retriever / [electronic resource] Doctor Ackerman's book of the Labrador retriever Book of the Labrador retriever Dr. Ackerman's book of Labrador retrievers / Lowell Ackerman.. — Neptune City, NJ : : T.F.H. Publications,, c1996.. — 96 p. : : col. ill. ; 23 cm.