= Big US Libraries I've Visited =

 .01  Library of Congress
 .02  Boston Public Library
 .08  '''University of California Berkeley'''
 .09  University of Colorado
 .10  University of Texas Austin
 .12  University of Chicago
 .13  University of California Los Angeles
 .15  '''Stanford'''
 .19  '''University of Washington'''
 .20  University of Minnesota
 .22  University of North Carolina Chapel Hill
 .30  University of Arizona
 .56  Brown University
 .58  University of California Davis
 .62  King County Public Library
 .66  '''University of Maryland'''
 .71  '''Johns Hopkins University'''
 .77  University of Hawaii Manoa
 .98  '''Massachusetts Institute of Technology'''

'''Bold''' libraries are > 20 hours of use, multiple days.

Many large libraries, like Princeton, Harvard, New York Public Library, are not visitor-friendly.

Hundreds of smaller libraries, and some foreign.  The Toronto Reference Library on Yonge Street is a special favorite.