According to Dave Thomson, this representation of Hannibal is based on Henry Lewis' sketchbook pages of 31 July 1848:     "The panorama was done in the style of a post office mural from the Depression-era WPA. The white building above the steamboat paddle box represents the office of Justice of the Peace J. M. Clemens (Sam's father). The Clemens family lived one block further back from the river.     "Using the 1854 map of Hart and Mapother as well as Ruger's 1869 bird's eye view I determined as closely as possible the materials the depicted buildings were made of, brick predominating with the white and gray buildings constructed from wood. The buildings on the far left are the pork slaughtering and packing business. The building on the far right I believe was a sawmill. Other pork packing businesses and a tobacco factory most likely occupied the neighboring buildings on the far right. The other brick structures would have been occupied by hostelries, merchants and tradesmen, warehouse facilities, &c. As a foreground focal point I added the steamboat "Missouri" (aka the "Big Missouri"), which operated on the Mississippi from 1845-1851. The "Big Missouri" is the boat Ben Rogers impersonates in Chapter 2 of Tom Sawyer.     "The image was colorized with the help of my friend Ed Garbert. We put the light source in the east, as the village would appear in the morning (and since the town is laid out at a northwest to southeast angle parallel to the river, this is how the buildings are lit to best advantage). Ed 'painted' the majority of the buildings with a Photoshop program and I modified the foliage, added the steamboat and modified the color scheme.     "The National Geographic article 'The Mighty Mississippi' (1971) reproduces the two pages from Lewis' sketchbook on which this picture is based. My original black and white rendering to the panorama can be seen HERE, and was featured on the cover and fly leaves of Hannibal Too, by Hurley and Roberta Hagood (1986)."