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This online presentation of the HABS/HAER/HALS collections includes digitized images of measured drawings, black-and-white photographs, color transparencies, photo captions, written history pages, and supplemental materials.

Since the National Park Service's HABS, HAER and HALS programs create new documentation each year, documentation will continue to be added to the online collections.

The collections document achievements in architecture, engineering, and landscape design in the United States and its territories through a comprehensive range of building types, engineering technologies, and landscapes, including examples as diverse as the Pueblo of Acoma, houses, windmills, one-room schools, the Golden Gate Bridge, and buildings designed by Frank Lloyd Wright.

Administered since 1933 through cooperative agreements with the National Park Service, the Library of Congress, and the private sector, ongoing programs of the National Park Service have recorded America's built environment in multiformat surveys comprising more than 556,900 measured drawings, large-format photographs, and written histories for more than 38,600 historic structures and sites dating from Pre-Columbian times to the twentieth century.

“It’s like taking a look into a picture of what was,” said Ben Poling of Salamanca, New York, a forestry graduate student who worked on the project.Originally, Pulice believed that the kitchen and slave quarters were probably constructed in the 1830s; however, the dendrochronology work done by Copenheaver of the Department of Forest Resources and Environmental Conservation and her students helped pinpoint the timeframe.The kitchen structure at Greenfield Plantation, pictured after planks were replaced during a stabilization project in 2011, features a front overhang where a staircase provided access to the second floor.Photo by Mike Pulice, Virginia Department of Historic Resources.Dendrochronology is a method of using tree rings to determine the age of a tree, or in this case, a wooden structure.“In many ways, this is more exciting than confirming our original hypothesis.

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