There are many articles that explain how to manually express Human Breast Milk.
I have found it to be a valuable tool and have discovered that it can empty my breast the best.
Medela’s Pictoral overview of Manual Expression
Le Letche League’s Written overview of Manual Expression
The Womanly Art of Breastfeeding : (La Leche League International Book) has many more resources on manually expressing breast milk along with valuable information on breast feeding.
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I also have found that manual expression is very effective and almost as fast as a pump, but it takes a little practice to get good aim to save it.