There are actually two form 4562's and they both print in landscape format. One is titled "Depreciation and Amortization Report" and the other is "Alternative Minimum Tax Depreciation". More than likely, the first one is the only one you need. You only need the 2nd one if you are asked for AMT depreciation amounts.
To get the total depreciation taken on an asset, add together the amounts in the "Prior years Depr" column and "current year depr" column. The total is the amount of depreciation taken on that specific asset.
