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We describe explicit open books on arbitrary plumbings of oriented circlebundles over closed oriented surfaces. We show that, for a non-positiveplumbing, the open book we construct is horizontal and the correspondingcompatible contact structure is also horizontal and Stein fillable. Inparticular, we describe horizontal open books on some Seifert fibered3--manifolds. As another application we describe horizontal open booksisomorphic to Milnor open books for some complex surface singularities.Moreover we give examples of tight contact 3--manifolds supported by planaropen books. As a consequence the Weinstein conjecture holds for these tightcontact structures.

EXPLICIT HORIZONTAL OPEN BOOKS ON SOME PLUMBINGS