Economic Value of Our Native Birds: Discussed by Orders and Families; Order XIII, Macrochires, Goatsuckers, Swifts, Humming-Birds, Etc.; Family 20, Caprimulgidae Nighthawks, Whippoorwills, Etc.; Family 21, Micropodidae, the Swifts; Family 22, Surface, H. A. Heftet / 2018 / Engelsk
Zoological Bulletin of the Division of Zoology of the Pennsylvania Department of Agriculture, Vol. 5: May 1, 1907 (Classic Reprint) Surface, H. A. Heftet / 2018 / Engelsk
First Report of the State Bee-Keepers' Association of Pennsylvania, 1906 (Classic Reprint) Surface, H. A. Innbundet / 2018 / Engelsk
Birds Around the Farm: I. Bird Houses and Nesting Sites (With Eight Illustrations by Mrs. H. A. Surface) II. Their Economic Value, Destruction and Preservation III. Bird Study: Its Educational Value and Methods (Classic Reprint) Surface, H. A. Innbundet / 2018 / Engelsk
Zoological Bulletin of the Division of Zoology of the Pennsylvania Department of Agriculture, Vol. 5: May 1, 1907 (Classic Reprint) Surface, H. A. Innbundet / 2018 / Engelsk
First Report of the State Bee-Keepers' Association of Pennsylvania, 1906 (Classic Reprint) Surface, H. A. Heftet / 2018 / Engelsk
Economic Value of Pennsylvania Animals in Relation to Agriculture: Shown in the Agricultural Exhibit of Pennsylvania at the St. Louis Exposition (Classic Reprint) Surface, H. A. Innbundet / 2019 / Engelsk
Economic Value of Our Native Birds: Discussed by Orders and Families; Order XIII, Macrochires, Goatsuckers, Swifts, Humming-Birds, Etc.; Family 20, Caprimulgidae Nighthawks, Whippoorwills, Etc.; Family 21, Micropodidae, the Swifts; Family 22, Surface, H. A. Heftet / 2018 / Engelsk
Economic Value of Pennsylvania Animals in Relation to Agriculture: Shown in the Agricultural Exhibit of Pennsylvania at the St. Louis Exposition (Classic Reprint) Surface, H. A. Heftet / 2019 / Engelsk
Economic Value of Our Native Birds: Discussed by Orders and Families; Order XIII, Macrochires, Goatsuckers, Swifts, Humming-Birds, Etc.; Family 20, Caprimulgidae Nighthawks, Whippoorwills, Etc.; Family 21, Micropodidae, the Swifts; Family 22, Discussed by Orders and Families; Order XIII, Macrochires, Goatsuckers, Swifts, Humming-Birds, Etc.; Family 20, Caprimulgidae Nighthawks, Whippoorwills, Etc.; Family 21, Micropodidae, the Swifts; Family 22, Trochili Surface, H. A. Innbundet / 2018 / Engelsk
Birds Around the Farm: I. Bird Houses and Nesting Sites (With Eight Illustrations by Mrs. H. A. Surface) II. Their Economic Value, Destruction and Preservation III. Bird Study: Its Educational Value and Methods (Classic Reprint) Surface, H. A. Heftet / 2018 / Engelsk
Monthly Bulletin of the Division of Zoology, Vol. 4: For May, 1906 (Classic Reprint) Surface, H. A. Heftet / 2018 / Engelsk
Monthly Bulletin of the Division of Zoology, Vol. 4: For May, 1906 (Classic Reprint) Surface, H. A. Innbundet / 2018 / Engelsk