The weight charts are informative, but they could be more useful with some further number crunching and layout.
For instance, a commercial treeguy who produces commercial firewood doesn't really much care how much a 12" (30.5 cm) length of wood weighs because he's shooting for 16" (40.6 cm) Twelve inches would be an oddball size.
Smaller diameters, weight is never really considered when bucking firewood. Its the bigger diameters that weight becomes an increasingly bigger issue. A 16" block of 16" diameter hardwood weighs what? A 24" (61 cm) diameter firewood-length block weighs what? The biggest tree diameter the pro-bucker would likely get into would be, say 4 feet (122 cm), so what does a 16" cookie, 4 feet across weigh. This matters, as the round often needs to be either lifted onto a truck, or rolled up an incline.
For commercial firewood makers, a chart of the species, offering the weights in standard firewood length would be interesting to know. The loaders could guess the weight of the round, then check their guesses against the chart, keep the mood light during the heavy lifting.