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Air-Inflated, Double-Layer Polyethylene Greenhouse
Society: ASABEMain Category: Agricultural & BiologicalSub Category: StructuresEra: 1960-1969DateCreated: 1964Foran HallNew BrunswickState: NJZip: 08901Country: USAWebsite: https://www.asabe.org/awards-landmarks/asabe-historic-landmarks/air-inflated-double-layer-polyethylene-greenhouse-44.aspxCreator: Roberts, William J.

A crucial step in the evolution of modern plant agriculture was the development of low-cost, energy-efficient greenhouse structures that provide optimum growing conditions year-round. In 1964, Professor William J. Roberts developed the first air-inflated double-layer polyethylene greenhouse covering system at Cook College, Rutgers University.

YearAdded:
2004
Image Credit: Courtesy Flickr/Dwight Sipler (CC BY 2.0)Image Caption: A cat scales an air-inflated double-layered polyethylene greenhouse
City Plan of Philadelphia
Society: ASCEMain Category: CivilSub Category: StructuresEra: 1600sDateCreated: 1682PhiladelphiaState: PAZip: undefinedCountry: USAWebsite: https://www.asce.org/project/city-plan-of-philadelphia/

The City Plan of Philadelphia is a seminal creation in American city planning in that it was the first American City Plan to provide open public squares for the free enjoyment of the community and a gridiron street pattern featuring streets of varying widths: wide main streets and narrower side streets. In addition this plan was the first city plan in the United States to provide for long-term urban growth. These features inspired the planners of many cities to adopt the Philadelphia Plan as a model. 

YearAdded:
1996
Image Credit: Courtesy Wikipedia/DogearsImage Caption: The City Plan of Philadelphia pioneered many features of American city planning.Era_date_from: 1682
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