Formed in 1856, Stanley Gibbons is a highly-respected rare stamp dealer. They have a publishing house (https://www.stanleygibbons.com/publishing/publishing-house) and have published award winning stamping catalogs for stamps from Great Britain, The Commonwealth, Germany, and other countries.
I really love their Guide to Stamp Collecting (https://www.stanleygibbons.com/collecting-stamps/new-stamps). It is a must see for newbies to stamping like me. It include specific steps for starting a stamp collection and a section for storing and caring for your stamps. I’ve added it to my Resource Directory under Learning Sources for Philately.
They have a very informative YouTube site with video guides on stamps on aspects of stamp collecting and stamps from various subjects and time periods. (https://www.youtube.com/channel/UCvbKGINHrVg2z4OdEdw3S3A)
State of Stamp Collecting 
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