Laser Challenge 18

1972 • 21 Readers • 160 pages • 3.6

1987 • 646 Readers • 544 pages • 3.5

2016 • 829 Readers • 9h 31m • 4.2

1985 • 1 Reader • 1 page • 4

2010 • 312 Readers • 494 pages • 3.5

2011 • 23 Readers • 97 pages • 3.3

1962 • 39 Readers • 160 pages • 3.6

2006 • 2,703 Readers • 400 pages • 3.9

2014 • 1,302 Readers • 518 pages • 4.1

2016 • 520 Readers • 384 pages • 4.4

1940 • 53 Readers • 156 pages • 3.1

2014 • 20 Readers • 256 pages • 3.6

1978 • 13 Readers • 364 pages • 3.7

1983 • 4 Readers • 755 pages • 3.3

2015 • 90 Readers • 432 pages • 3.7