"Initially designed as part of a two-pronged work, of which Physique and delinquency [published in 1956] was the first." Both works are based on "the ...
"Initially designed as part of a two-pronged work, of which Physique and delinquency [published in 1956] was the first." Both works are based on "the parent volume, Unraveling juvenile delinquency, " published in 1950.