21. Health and sanitation program: agreement between the United States of America and El Salvador : effected by exchange of notes signed at San Salvador, May 4 and 5, 1942
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22. Health and sanitation program: agreement between the United States of America and Ecuador : effected by exchange of notes signed at Washington February 24, 1942
23. Health and sanitation program: agreement between the United States of America and Haiti : effected by exchange of notes, signed at Port-au-Prince, June 29 and July 12, 1944
24. Health and sanitation program: agreement between the United States of America and Uruguay : effected by exchange of notes, signed at Washington, October 1 and November 1, 1943
25. Health and sanitation program: agreement between the United States of America and Peru : effected by exchange of notes, signed at Washington, May 9 and 11, 1942
26. Health and sanitation program: agreement between the United States of America and Venezuela : extending with modifications the agreement of February 18, 1943 : effected by exchange of notes, signed at Caracas June 28, 1944, effective July 1, 1944
27. Health and sanitation program: agreement between the United States of America and Paraguay : effected by exchange of notes, signed at Washington, May 18 and 22, 1942
28. Schools and classes for exceptional children. The child with impaired vision
29. Conserving the health of Colorado's children: a handbook for teachers
30. Schools and classes for exceptional children. The child with impaired hearing
