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Covers.
The Colorado Local Post produced two types of covers.  First day covers (usually cacheted with a design matching the stamp design) and event covers that entailed use of stamps created for a particular type of service (i.e. balloon mail, glider mail, etc.).
 
Thumbnail images are presented on this and following pages.  Click on any thumbnail to enlarge the cover and view details about it, such as date of issue, quantity serviced, etc.
First Day Covers - page 1
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Copyright © 1978-2010 Stephen R. Datz.  All rights reserved.