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Metsker's Map of Mono County California, compiled by Charles F. Metsker around 1955, provides a detailed representation of Mono County, California, distinguishing various features such as paved roads, state highways, U.S. routes, gravel and dirt roads, trails, railroads, game preserve boundaries, intermittent creeks, schools, ranger stations, camps, lookouts, national forest boundaries, elevations, and power transmission lines. With offices in Tacoma, Portland, and Seattle, Metsker's work reflects a mid-20th-century approach to cartography and civil engineering.

Mono County, situated on the eastern slopes of California's Sierra Nevada, has long been characterized by its rugged terrain and striking natural beauty. The mapping of the county during this period coincides with a growing interest in outdoor recreation, conservation, and infrastructure development.

Charles F. Metsker's compilation exhibits a meticulous attention to the diverse elements that define Mono County's geography. The distinction between paved, graveled, dirt, and inferior roads, for example, offers insights into the transportation infrastructure of the time. The inclusion of features such as game preserve boundaries, schools, camps, and lookouts speaks to both the human and natural aspects of the region.

The legend, providing symbols and codes for various elements on the map, is indicative of the technical precision employed in its creation. Metsker's work, as a civil engineer, adds a layer of authenticity and reliability to the map, reflecting a balance between cartographic detail and usability.

Metsker's Map of Mono County California stands as a valuable historical document, capturing the geographical and infrastructural landscape of Mono County during a significant period of growth and development in post-war America. Through its detailed rendering of roads, natural features, administrative divisions, and other specific landmarks, the map offers a window into the planning, engineering, and recreational aspects of mid-20th-century rural California. Its combination of technical rigor and aesthetic clarity contributes to its lasting relevance as both a functional guide and a reflection of its era.