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.