This booklet hardly needs a preface; the contents, I think, speak for themselves. It contains a short and carefully brought up to date resume of all that I, as a private University Lecturer in Amsterdam, have tried to teach my pupils. It is intended as a general introduction to ethnomusicology, before going on to the study of the forms of separate music-cultures. I sincerely hope that those, who wish to teach themselves and to qualify in this branch of knowledge, will find a satisfactory basis for self tuition in the matter here brought together. Regarding the possibility of a new edition, any critical remarks or infor mation as to possible desiderata would be very gratefully received. J. K. PREFACE TO THE SECOND EDITION My request for critical remarks and desiderata has not been ignored. My sincere thanks to all who took the trouble to let me know what they missed in my booklet. Through their collaboration the contents have undergone a considerable improvement and enlargement as compared to the original edition issued in 1950 by the Royal Tropical Institute, Amsterdam, under the title 'Musicologica'. I have taken care to add many particulars from non-European sources, with the result that now the book is no longer so Europe-centric as it was.

Catalogus van een tentoonstelling over de beeldende kunst van de traditionele Midden-Afrikaanse koninkrijken.

In 1969 the U.S. Air Force issued a statement that read' "No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security." This statement is patently false. It has been proven untrue by the testimony of many military officers and airmen and documentation of incidents involving UFOs and nuclear weapons, testimonies of which the U.S. Air Force was fully aware. Unidentified details many of these testimonies, some for the first time. As partial justification for its position, the Air Force cites a University of Colorado study that was contracted and paid for by federal funds. Unidentified reveals how this study was actually just another part of the plan to cover up the reality of the UFO phenomenon. For the first time, Unidentified publishes evidence that the investigators for the Colorado study knew about the UFO-related missile shutdown incidents but did not investigate them or include them in their final report.