Keywords: Net-Zero Energy Building Construction Time Lapse Video - April 2011 (6026255428).jpg Net-Zero Energy Building Construction Time Lapse Video - April 2011 Credit NIST https //www flickr com/photos/usnistgov/6026255428/ Net-Zero Energy Building Construction Time Lapse Video - April 2011 2011-08-09 09 19 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 N06/6026255428 2016-09-07 02 13 28 United States Government Work Uncategorized 2016 September 8 |