Published in December 1972 by Warren Publishing, this is a collection of stories (having nothing to do with Dracula) reprinted from issues #1-6 of New English Librarie's Dracula magazine, itself a translation of Buru Lan's Drácula series.
Most stories are periodically continuing strips starring Wolff, Sir Leo, or Agar-Agar, and they feel incomplete because these are only from the first 6 issues, while the UK series lasted 12 issues and the Spanish series lasted 60! So to continue the adventures of the characters, one has to track down the issues that followed. Warren never got around to publish Book Two. (While NEL did publish a Dracula Annual that included stories from #1-12, which would have consisted of Warren's Books One and Two.)
Check here for info on the original series published by Buru Lan in 1972-73.
NOTE: Warren previewed the book by including one of the stories, "The Viyi", in color, in their b&w horror magazines, in both Creepy #51 and Vampirella #22.