اذا لم تجد ما تبحث عنه يمكنك استخدام كلمات أكثر دقة.
"Prepared by Assistant Ray V. Hennen and his aid D.B. Reger."
"Soil survey of the Clarksburg area (Doddridge and Harrison counties) by Charles N. Mooney and W.J. Lattimer": p. [661]-695