Fig. 2.

Timeline from 1979 to 2014 continuing the historical development of strategies for coal mine dust diseases from Fig. 1. Primary references for points mentioned are as follows: (a) Gormley et al. (1979), (b) Bennett et al. (1979), (c) Reisner et al. (1982), (d) Le Bouffant et al. (1988), (e) Vallyathan et al. (1988a), (f) Vallyathan (1994), (g) Huang et al. (1994), (h) Attfield and Morring (1992b), (i) Attfield and Seixas (1995), (j) Vallyathan et al. (1998), (k) Huang et al. (1999, 2002), and (m) Huang et al. (2005)