Yes, volumes 1 and 2 of Molnar’s exercise books, that I also use, are very good, and used to be carried by Lyon and Healy. Sometimes, imported music is too expensive to carry so they remove it from their lists.When Molnar left Austria to begin his career in Japan, he was already a fine professional harpist. He distilled the European technique for his students, into the most useful excercises for brilliant technique, and the result of his years of teaching is that Japan has produced many prizewinning harp virtuosos. Perhaps Holywell Music in England has these volumes, which must not be photocopied, of course, since Molnar is still alive.