First thing in the morning the Little Androscoggin runs low and brown-green past Welchville, and the mill-street lawns above it are still holding dew. OXFORD LAWN AND GARDEN mows, trims and edges through Oxford, then comes back in spring and fall for the heavy raking and haul-off. Dooryards down in the river bottom grow thick and grow fast; the ledgy ground up off the hill roads asks for a lighter hand. Getting a village lawn cut before the day warms is one of the good parts of the job — stripes still damp, walk swept, gate latched behind. It's plain work on streets where people notice.