%0 Journal Article
%T The problem of visual direction, Part I. The history to 1900
%J American journal of optometry and archives of American Academy of Optometry
%D 1951
%A Walls, G. L.
%V 28
%N 2
%P 55-83
%X <p>[Abstract unavailable]</p><p>Language: en</p>
%G en
%I American Journal of Optometry Publishing Association
%@ 0002-9408
%U http://dx.doi.org/