Sections 621 to 624, Pub. L. 90–538, §§ 2–5, Sept. 30, 1968, 82 Stat. 901, 902, popularly known as the Handicapped Childrens Early Education Assistance Act, related to the following subject matter: Section 621, experimental preschool and early education programs for handicapped children: authorization, special problems of the handicapped, National distribution, urban and rural areas, and scope of activities and services; community coordination of programs; and Federal share and non-Federal contributions. Section 622, evaluation. Section 623, definition of handicapped children. Section 624, appropriations authorization. For general subject matter of these sections, see sections 1423, 1425, 1401 (1), and 1426 of this title, respectively.