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The book is news to me, but apart from visual/MathML problems (tables, a few formulae) I liked all I saw. Seems like a great book to complement Polya's "How to Solve It?" as it, in a similar style and manner, tried to hammer home general ways of sidesteping the need for calculus. Definitely will give a more thorough look and mine for ideas/examples, you can never have too many of those. We have a similar one, Rachunek Różniczkowy i Całkowy by Franciszek Leja, but its aim is about aiding students with clarification or making sense of calc 1-3 lectures with a heap of varied examples and a dash of easy problems to-solve. Think something like a core textbook spliced with Cliff's Notes.