I have one that's called Dewa sanzan shinko~ to Gassan to~ko~ (The Religous Practices of the Three Peaks of Dewa Province and the Gassan Swordsmiths) which I would recommend.
Shown in the catalogue are: 13 ko-gassan blades (one photo, others are oshigata), 13 blades by Gassan Sadayoshi, the founder of Osaka Gassan (one photo, others are oshigata), two blades by Sadayoshi's students (oshigata), 15 blades by Gassan Sadakazu (nine photos, rest are oshigata), 6 blades by Gassan Sadakatsu (all oshigata), 12 blades by Gassan Sadakazu II [sadaichi] (ten photos + oshigata), and 3 blades by Gassan Sadatoshi (all photos).