A good source of historical journal articles, since JSTOR's coverage goes back to the 1st volume of a publication. Search the HISTORY OF SCIENCE & TECHNOLOGY COLLECTION (BROWSE by subject at top of page) or search the whole collection.
Begun in 1933, this collection documents 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. 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.
The Hathi Trust is a huge digital library that Swarthmore has recently joined, so you might be able to get access to many old volumes of ENR. Some volumes you will only be able to SEARCH, others you will be able print or download.
The New York Times (1851-2010): ProQuest Historical Newspapers