Donald H. Gale

title	ISBN-13	year of publication
Approach to Number: Number Language Bk. 1	978-0-7175-0148-9	1964
Approach to Number: Number Language Bk. 2	978-0-7175-0149-6	1964
Approach to Number: Number Language Bk. 3	978-0-7175-0150-2	1964
Approach to Number: Number Language Bk. 4	978-0-7175-0151-9	1964
Approach to Number: Number Language Bk. 5	978-0-7175-0152-6	1964
Approach to Number: Number Language Bk. 6	978-0-7175-0153-3	1964
Approach to Number: Number Readiness Bk. 2	978-0-7175-0131-1
Approach to Number: Number Readiness Bk. 3	978-0-7175-0132-8
Approach to Number: Number Readiness Bk. 4	978-0-7175-0133-5
Approach to Number: Number Readiness - Book 2	978-0-7175-0130-4	1968
Approach to Number: Number Readiness Workbk. 1	978-0-7175-0155-7
Approach to Number: Number Readiness Workbk. 2	978-0-7175-0156-4
Approach to Number: Number Readiness Workbk. 3	978-0-7175-0525-8
Approach to Number: Number Readiness Workbk. 4	978-0-7175-0526-5
Approach to Number: Number Readiness Workbk. 5	978-0-7175-0538-8
Approach to Number: Number Readiness Workbk. 6	978-0-7175-0560-9
Approach to Number: Teaching of Number	978-0-7175-0154-0
Global Activities: Blue Moon Book Bk. 2	978-0-7175-0529-6	1970
Global Activities: Green Line Book Bk. 3	978-0-7175-0530-2	1970
Global Activities: Orange Ball Book Bk. 5	978-0-7175-0532-6	1971
Global Activities: Red Arrow Book Bk. 1	978-0-7175-0528-9
Global Activities: Silver Coin Book Bk. 6	978-0-7175-0579-1	1971
Global Activities: Yellow Submarine Book Bk. 4	978-0-7175-0531-9	1970