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The models seek to jointly optimize the construction and maintenance schedule of forest road networks with landing site selection and transportation routing for timber production. This problem is, in general, difficult to solve as it contains the so\u2010called fixed charge network flow problem, which is known to be NP\u2010hard. One of the proposed MILP formulations considers 3\u2010index continuous variables to represent timber flows on road segments in each period. The presence of Big\u2010M constraints leads to weak linear relaxation bounds. Disaggregating flow variables, according to timber origin, results in a novel 4\u2010index formulation with very tight linear relaxation bounds. Nevertheless, the number of variables increases prohibitively. This research makes use of spatial constraints common to Smallholding Forested Landscapes to develop a solution approach that reduces the number of flow variables in the new 4\u2010index model. 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