Author
Educational Resources Information Center (U.S.)
721
Scott, Foresman and Company
166
National Institute of Education (U.S.)
165
Lakeshore Learning Materials (Firm)
158
Learning Resources (Firm)
153
National Center for Education Statistics
150
ProQuest Ebook Subscriptions
147
Houghton Mifflin Company
146
ProQuest (Firm)
138
AIMS Education Foundation
125
Delta Education (Firm)
118
GEMS (Project)
115
Super Duper Publications (Firm)
102
Lawrence Hall of Science
101
Lipman, Matthew
101
Teacher Created Materials, Inc
99
Pearson Education, Inc
94
TERC (Firm)
94
Macmillan/McGraw-Hill School Publishing Company
93
California State College (Pa.). Dept. of Elementary Education
90
James Hosmer Penniman Book Fund
89
Educational Testing Service
81
United States. Office of Educational Research and Improvement
78
Millersville State College (Pa.). Graduate Studies Division
77
National Science Teachers Association
71
National Council of Teachers of Mathematics
65
Harcourt, Inc
64
Addison-Wesley Publishing Company
61
ERIC Clearinghouse for Social Studies/Social Science Education
61
Houghton Mifflin Harcourt Publishing Company
61
California State College (Pa.). Division of Graduate Studies
60
National Geographic Society (U.S.)
58
California State College (Pa.). School of Graduate Studies
57
ETA/Cuisenaire (Firm)
57
University of Chicago. School Mathematics Project
57
Moravian College. Masters of Education
56
Charles, Randall I. (Randall Inners), 1949-
53
Pearson/Scott Foresman
53
ERIC Clearinghouse for Science, Mathematics, and Environmental Education
50
Lebanon Valley College
50
PALCI EBSCO books
50
ERIC Clearinghouse on Languages and Linguistics
48
Harcourt School Publishers
48
National Science Resources Center (U.S.)
47
Cordel, Betty
46
United States. National Aeronautics and Space Administration
44
Cuisenaire Company of America
42
Russell, Susan Jo
42
Science and Technology for Children (Project)
41
Stenhouse Publishers
41
more ...