Johanne Yakula of FROM TIMES PAST addresses the issue and provides some possible solutions: http://bit.ly/1d6le3o
You may also have an interest in a Flickr album VINTAGE & ANTIQUE FURNITURE AND LIGHTING, A COLLECTION OF EPHEMERA, OBJECTS AND MORE. Click here.
UDPATED: Fortunately copies of SOME of the old Edison bulbs are being made today but remain very pricey....you can also get some of the old fashioned globe light bulbs, for the moment, at Home Depot.
And you may also enjoy this outstanding MID-CENTURY MODERN LIGHTING COLLECTION AND MORE at https://everythingcroton.blogspot.com/2016/04/outstanding-mid-century-modern-lighting.html