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Business records 2

Catalogs (documents) 2

Clippings (information artifacts) 2

Correspondence 2

Financial records 2

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Marketing 2

Roses--History--20th century 2

Awards 1

Contracts 1

Diaries 1

France--Description and travel 1

Gardening--History--19th century 1

Gardening--History--20th century 1

Gardening--Periodicals 1

Gardening--Societies, etc.--History--20th century 1

Gardening--United States--History--20th century 1

Histories (literature genre) 1

Horticultural products industry--History--20th century 1

Horticulture--History--19th century 1

Horticulture--History--20th century 1

Kennett Square (Pa.)--History--20th century 1

Lecture notes 1

Lectures 1

Licenses 1

Manuscripts (documents) 1

Negatives (photographic) 1

Nurseries (Horticulture)--History--19th century 1

Nurseries (Horticulture)--History--20th century 1

Nurseries (Horticulture)--United States--History--20th century 1

Patents 1

Periodicals 1

Photovoltaic cells--Research--United States 1

Physicists 1

Physics--Study and teaching 1

Plant hybridization--History--20th century 1

Plants, Cultivated--Patents 1

Plants, Cultivated--Patents--History--19th century 1

Plants, Cultivated--Patents--History--20th century 1

Poems 1

Press kits 1

Publications (documents) 1

Reports 1

Research notes 1

Roses--Breeding--United States--History--20th century 1

Roses--History--19th century 1

Solar energy 1

Solar houses 1

Stock certificates 1

Technical writing 1

Transparencies 1

Travel--History--20th century 1

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Language

German 1

 

Names

Conard-Pyle Co. 2

Atlantic Coast Nurseries, Inc. 1

Böer, K. W. (Karl Wolfgang), 1926-2018 1

International Solar Energy Society 1

Pyle, Robert 1

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University of Delaware 1

University of Delaware. Institute of Energy Conversion 1

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