Notes: Unknown printing rank. No price on book (price category: 1 circle on spine). Note that sheets from the true (?) first edition (this one) were used (same printing batch on both books) for this book which was either really published in 1975 and fitted with a "test" cover or is a re-use of the 1975 sheets with a later cover (the same as the one used for the april 1977 printing).