File:Frick To Carnegie Letter About The Arming Of The Pinkertons.jpg
The highly detailed, digitized and entire copy of this letter is available from the University of Pittsburgh Archives Service Center, The University of Pittsburgh Library System and can be viewed here:
The image is part of the The Henry Clay Frick Business Collection containing Fricks business records. The copyrights of the items have expired. The catalog describing the contents of the collection can be accessed here: http://digital.library.pitt.edu/cgi-bin/f/findaid/findaid-idx?c=ascead;type=simple;q1=Henry%20Clay%20Frick;rgn=Entire%20Finding%20Aid;size=25;view=reslist;subview=standard;cc=ascead;sort=occur;start=1;didno=US-PPiU-ais200206;focusrgn=contentslist;byte=29484518
This image is provided by the Wikipedia Visiting Scholars program at the University of Pittsburgh.