Keywords: Net-Zero Energy Building Construction Time Lapse Video - September 2011 (6211936596).jpg Net-Zero Energy Building Construction Time Lapse Video - September 2011 Credit NIST https //www flickr com/photos/usnistgov/6211936596/ Net-Zero Energy Building Construction Time Lapse Video - September 2011 2011-10-04 11 23 https //www flickr com/people/63059536 N06 National Institute of Standards and Technology PD-USGov National Institute of Standards and Technology https //flickr com/photos/63059536 N06/6211936596 2016-09-07 02 12 37 United States Government Work Uncategorized 2016 September 8 |