The Medal Collector: A Guide to Naval, Military, Airforce and Civil Medals and Ribbons. E-book. Formato PDF Stanley Currie Johnson   -  Forgotten Books, 2017  - 

In order to differentiate between the medals intended to be worn and those that are circular like coins and possess no clip attachment, there is a growing tendency to reserve the word medal for the former and to speak of the latter as medallions. It cannot be claimed, however, that the meanings here suggested are universally accepted, though the trend is to observe them, more and more, as time goes on.

The Stamp Collector: A Guide to the World's Postage Stamps. E-book. Formato PDF Stanley Currie Johnson   -  Forgotten Books, 2017  - 

In recent years, the collector has indulged, in philately with more method and science than was his former wont so that now there is a demand for information and guidance greater than has ever been evinced before. To supply these needs has been our mission in writing the pages which follow.