The ever-efficient Rodgers pulled a one-inch Survey map out of the pocket of his car, and studied it.

一向高效的罗杰斯从他的汽车口袋里掏出一张一英寸的调查地图，研究它。

They used survey maps and historical sources such as woodblock prints, texts and paintings from the 18th and 19th centuries to show how the park changed over time.

他们使用了测量图和历史资料，如18世纪和19世纪的木刻版画、文字和绘画，以展示公园随着时间如何变化。