There are 5 North American HARVARD 4 aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1946 and 1952.
N1811B
1952 North American HARVARD 4
Santa Monica, CA
N4289C
1952 North American HARVARD 4
Wildwood, MO
N7553U
1952 North American HARVARD 4
Wenatchee, WA
N7554U
1952 North American HARVARD 4
Woodstock, IL
N28500
1946 North American HARVARD 4
Livermore, CA