One has 39 pages and the other has 67 pages.
3 X HORNBY RAILWAY CATALOGUES 1978, EDITION 20 & STEPHENSONS EDITION
3 X HORNBY RAILWAY CATALOGUES 35, 36 & 37 EDITIONS
3 X HORNBY RAILWAY CATALOGUES 38, 39 & 40 EDITIONS
3 X HORNBY RAILWAY CATALOGUES 41, 42 & 43 EDITIONS
3 X HORNBY RAILWAY CATALOGUES 30TH, 34TH AND 150 YEARS OF RAILWAYS EDITIONS
HORNBY RAILWAY CATALOGUES MECANO MAGAZINE K'S LOCOMOTIVES, REEVES CATALOGUE x5
