Text ( visual ) : unmediated Introduction to mathematics : with supplementary problems / Charles F. Brumfiel, Robert E. Eicholz, Merrill E. Shanks. -- Sacramento : California State Department of Education , 1965. -- xi, 369 p. : ill. (some col.) ; 24 cm. -- (California State series). -- Includes index ; "This book is in the Addison-Wesley science and mathematics education series"--T.p. verso. -- (BA73961951) ; https://ci.nii.ac.jp/ncid/BA73961951 Author Heading(s): Brumfiel, Charles Francis ; Eicholz, Robert E. ; Shanks, Merrill