The Library Congress/Smithsonian videotape featuring Guy-Blache and Lois Weber films is excellent, though a racist joke in "Matrimony's Speed Limit" is upsetting. There is also Guy (before Blache) material on the "French" volume of Noel Burch's "What Do Those Old Films Mean?" series (available from Facets in Chicago). For prints, EmGee has a nice Guy-Blache reel for their typical low rental rates; you can also rent titles individually.