https://etc.usf.edu/clippix/search/?q=boundary%20markers&offset=100
Search for "boundary markers" pictures | ClipPix ETC: Educational Photos for Students and Teachers
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https://altoona.craigslist.org/clt/d/patton-pgc-patches-and-boundary-markers/7923180888.html
PGC patches and boundary markers - collectibles - by owner - sale - craigslist
3 PGC patches and 2 boundary markers I found on the ground in my many travels . Buyer is responsible for shipping. Accept PayPal.
boundary markersby ownerpgcpatchescollectibles