one at a time

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Related to one at a time: One Step at a Time
References in classic literature ?
They came up one at a time and jumped for the rail.
One at a time, compelling the others to remain in their places, he directed the return boys astern and ashore.
In the absence of roads, his tree trunks had to be transported during the summer season; each log was dragged along one at a time, and with no small difficulty, by means of a chain attached to a halter about his horse's neck, and an iron hook at the farther end of the chain, which was driven into the wood.