This is an old topic but I came across this article today: What Are These Giant Concrete Arrows Spread Across America? Read more: <http://twentytwowords.com/what-are-these-giant-concrete-arrows-spread-acros s-america/#ixzz3Wq1FQkQ5> http://twentytwowords.com/what-are-these-giant-concrete-arrows-spread-across -america/#ixzz3Wq1FQkQ5 And a Link to maps of known Arrows and Beacons Arrows Across America - Transcontinental Air Mail Routes http://www.dreamsmithphotos.com/arrow/arrows.html Jamie B "What doesn't kill you makes you stronger. Except for bears, bears will kill you." _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com <mailto:Utah-Astronomy@mailman.xmission.com> The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".