 His published observations, manuscript notes, and collections on aboriginal ceramics were never worked into a full-blown typology, and later analysts have interpreted them with markedly different conclusions (Schroeder 1958; May 1978; Van Camp 1979; Waters 1982a, 1982b; Seymour 1997; Burton and Quinn 2013).One researcher noted that Rogers' reports "so often present his formulations without detailing the evidence on which they are founded" (Ezell 1961