Wash the lettuces the night before. Wrap in a damp paper towel, and chill in zip-top plastic bags; cook the bacon, and toast the almonds too. Assemble and dress right before serving.
Whisk together first 5 ingredients in a large bowl, blending well. Add oranges and lettuces, tossing gently to coat. Sprinkle with crumbled bacon and sliced almonds. Serve immediately.
*Fresh orange segments may be substituted for canned mandarin oranges, if desired.
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