edit.default(get(subx, envir = parent), title = subx, ...)

edit(get(subx, envir = parent), title = subx, ...)

From Angrist and Lavy 1999 Quarterly Journal of Economics 114 533-575.  These are the 86 matched pairs in Figure 1.1 of DOS.
scode is their id.  numclass is number of classes.  cohsize is cohort size. avgmath avgverb are test scores.  tipuachz is percent disadvantaged
z indicates the side of 40, that is, the instrument.  pair is the matched pair number -- first two rows are pair 1.

From Costa, et al 1993 Cancer Research 53 460-463.  The data appear in Table 8.1 of DOS

Pinto Mutation Research 467 2000 105-111 Genetic Tox and Env Mut

Schoket Mutation Research 260 1991 89-98
Data in Figure 16.3 of DOS.
First columns are aluminum production workers; later columns are matched controls.

Werfel, et al. (1998) Elevated DNA single strand breakage frequencies in lymphocytes of welders exposed to chromium and nickel.  Carcinogenesis, 19, 413-418.
Data in Figure 3.1 of DOS