3 books in total. ICS Reference Library book 29A is a marine boilers and fuels Book 31A is Geometrical Drawing book 30 mercantile Marine engines very good inside. Old books circa 1905 - 1910 ish I believe. These were my late fathers who was a marine engineer and used these for his exams many decades ago. In good used condition. Very heavy nearly 2 KG each book. Any questions
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