  1973 - Practical Formulas for Hobby or Profit (Paperback) → Hardcover ISBN-13: 9780820603476 ISBN-10: 0820603473 Genre: Science & Math ?  Practical Formulas for Hobby or Profit (Other) → Paperback, Hardcover ISBN-13: 9780668044950 ISBN-10: 0668044950 ?  Practical Formulas for Hobby or Profit (Hardcover) → Paperback, Hardcover ISBN-13: 9780820602356 ISBN-10: 0820602353 ? |
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