ACKNOWLEDGMENTS. WE EXPRESS OUR DEEPEST GRATITUDE TO THE SCIENTIFIC COLLABORATORS OF THE ASTRONOMICAL COUNCIL OF AC. SCI. USSR V.I.MJAKUTIN AND A.E.PISKUNOV, TO THE SCIENTIFIC WORKERS OF THE STATE UNIVERSITY OF CHELJABINSK A.A.BESSONOV AND V.M.MIKHAJLIN AND TO ALL STAFF MEMBERS OF THE COMPUTATION CENTRE OE CHELJABINSK'S UNIVERSITY FOR THEIR INESTIMABLE HELP IN THE PROCESS OF WORKING OUT OF THE COMPUTER PROGRAM AND OF REGISTERING OF OUR CATALOGUE ON THE MAGNETIC BAND OF ELECTRONIC COMPUTER. WE ARE SINCERELY GRATEFUL TO ALL OUR COLLEAGUES WHO HAVE KINDLY SENT THEIR (RESULTS OF THE DETERMINATION OF PHOTOMETRIC AND ABSOLUTE ELEMENTS OF ECLIPSING BINARY SYSTEMS IN ADVANCE OF PUBLICATION: G.L.BERIOZKO(CHELJABINSK),I.I BONDARENKO(SVERDLOVSK),R.A.BOTSULA(KASAN'),L.F.ISTOMIN(SVERDLOVSK),P.K.KALV (TALLIN),F.Z.KUSHANOVA(CHELJABINSK),M.I.LAVROV(KASAN'),A.A.NALIMOVA (CHELJABINSK),T.S.POLUSHINA(SVERDLOVSK),I.B.PUSTYL'NIK(TARTU). WE WISH TO ACKNOWLEDGE THE ADVICES AND USEFUL CRITICAL REMARKS EXPRESSED BY M.I.LAVROV AND BY I.B.PUSTYL'NIK,IN THE PROCESS OF COMPILATION OF OUR CATALOGUE. WE WISH TO RECORD OUR APPRECIATION TO THE SCIENTIFIC WORKERS N.A.DUBININA, L.L.KOPTELOVA,T.G.MIKHAILOVA,O.B.PETUKHOVA,M.I.SAZHIN,T.A.TAIDAKOVA,AND TO THE STUDENTS OF THE STATE UNIVERSITY OF CHELJABINSK O.V.ERETNOVA,M.A. MEN'SHIKOVA,M.N.OL'NEVA,FOR THEIR VALUABLE ASSISTANCE DURING THE COMPILING OF THE CATALOGUE,AS WELL AS TO THE SCIENTIFIC WORKERS E.G.DUDOROVA AND E.L. SVECHNIKOVA FOR A NUMBER OF USEFUL CRITICAL OBSERVATIONS IN PROCESS OF THE TRANSLATION OF OUR CATALOGUE FROM RUSSIAN INTO ENGLISH. WE APOLOGIZE TO ALL THE READERS FOR THE NUMEROUS MISTAKES AND INEXACT EXPRESSIONS IN ENGLISH TRANSLATION OF THE PRESENT CATALOGUE,SINCE BOTH AUTHORS SPEAK ENGLISH TO AN INSUFFICIENT DEGREE.