  1981 - Math for Girls and Other Problem Solvers [Equals Series] (Paperback) ISBN-13: 9780912511016 ISBN-10: 091251101X Genres: Reference, Science & Math ?  101 Short Problems/101 Problemas Cortos a Collection of Short Open Mathematics Problems [Equals Series] (Paperback) ISBN-13: 9780912511269 ISBN-10: 0912511265 Genres: Reference, Science & Math ? |
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