Why don't folder sizes add up

If I add up the sizes as shown in Get Info for the top level folders on my mac I get about 172 GBytes used...  When i do Get Info on the Macintosh HD itself, it shows only 138 GBytes used...  What's the deal with the other 172 - 138 = 34 GBytes???  Are those hidden files or what??? 
thanks...  bob...

Of course! Thanks, Geoff!

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