2 collections that contain a reprint of Shaffer (1961). Could mental states be brain processes?
[pp. 113-122]
Borst, C.V. (Ed.). (1970). The mind-brain identity theory. Macmillan. doi:10.1007/978-1-349-15364-0_2
[Reprints in this collection]
Vesey, G. N. A. (Ed.) (1964). Body and mind. Readings in philosophy. George Allen and Unwin ltd
[Reprints in this collection]