aside from the pomegranate press books and "the first year" book i have this...
a book called the "dark shadows tribute" written by edward gross and james van hise, published by a company called 'pioneer books inc.' out of las vegas, NV in 1990. it's an oversized soft cover i found at a flea market a few years ago and maybe paid $5.00 for.
it has the usual "origins of" type chapter, profiles of dan curtis, art wallace and robert costello, pictures and an episode guide. more notable are interviews with jonathan frid, louis edmonds, jerry lacy and, interestingly, alexandra moltke, who tends to be rather mum about her time on the series. most notable however is what is perhaps the last known interview with grayson hall.
there are also interviews with production people like john sedwick and ron sprout.
i'v never seen this particular book anywhere so i consider it quite a find for my collection.