Relief patterns, dividing lines of, [226].
Repeating patterns, in earth relief, [223];
composite, [227].
Reservoirs, of lava, local, [95].
Residual rocks, [30].
Resistant rocks, in relation to erosion, [174].
Rhine, gorge of, [169].
Rhyolite, [463].
Ribbon falls, [378].
Richter, E., cited, [294].