Stereo Slide Folios

SSA operates several types of stereo slide folios:

	“Realist format” slide folios (for 41x101 mm (outside dimension) stereo slides)
	Medium format stereo slide folios
	Twin 2x2 format slide folios
	Viewmaster reel folios

Except for the “2x2” and “Viewmaster” folios, stereo slide folios are named for letters of the Greek alphabet (alpha, beta, etc.).  Individual boxes within each folio are numbered (e.g., 1 through 5) and referred to by shorthand notation, for example “G-3.”