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| TEACHING THROUGH SELF-INSTRUCTION: HOW TO DEVELOP OPEN LEARNING MDerek Roundtree ISBN13 9780893973568 / ISBN10 0893973564 BIOS - June 1, 1990 Paperback (389 pages) List Price: $33.50 |
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| Date | Minimum price | Average price | Maximum price | |||
| Apr 3 2009 | $13.26 | $26.29 | $39.66 | |||
| Aug 7 2009 | $15.61 | + | $18.77 | - | $21.92 | - |
| Aug 14 2009 | $15.59 | - | $19.81 | + | $21.92 | |
| Aug 23 2009 | $15.46 | - | $19.77 | - | $21.92 | |
| Dec 1 2008 | $12.11 | - | $25.94 | + | $39.85 | + |
| Dec 20 2009 | $16.00 | + | $28.81 | + | $47.87 | + |
| Jan 5 2009 | $13.23 | - | $26.86 | - | $41.71 | - |
| Jan 10 2010 | $16.00 | + | $28.21 | + | $47.87 | + |
| Jan 26 2009 | $12.51 | - | $27.41 | - | $41.71 | - |
| Jul 4 2009 | $14.80 | + | $24.90 | - | $37.98 | - |
| Jul 13 2009 | $14.49 | - | $24.80 | - | $37.98 | |
| Jul 19 2009 | $21.92 | + | $27.27 | + | $37.98 | |
| Jul 28 2009 | $15.24 | - | $25.05 | - | $37.98 | |
| Jun 6 2009 | $14.75 | - | $19.53 | - | $21.92 | - |
| Jun 17 2009 | $14.76 | + | $24.89 | + | $37.98 | + |
| Jun 26 2009 | $14.87 | + | $24.92 | + | $37.98 | |
| Mar 8 2009 | $11.84 | - | $26.50 | + | $41.71 | + |
| Mar 9 2010 | $16.00 | + | $28.13 | + | $47.87 | + |
| Mar 18 2010 | $16.00 | $20.29 | - | $22.44 | - | |
| May 14 2009 | $13.97 | - | $24.52 | + | $37.67 | + |
| May 24 2009 | $14.56 | + | $24.72 | + | $37.67 | |
| Nov 12 2009 | $20.72 | + | $34.30 | + | $47.87 | + |
| Nov 17 2008 | $11.99 | - | $26.69 | - | $42.45 | - |
| Nov 23 2008 | $11.59 | - | $27.66 | + | $42.45 | |
| Oct 4 2008 | $14.41 | + | $20.12 | - | $25.96 | - |
| Oct 8 2008 | $13.02 | - | $19.66 | - | $25.96 | |
| Oct 13 2008 | $12.23 | - | $19.40 | - | $25.96 | |
| Oct 21 2008 | $13.00 | + | $19.65 | + | $25.96 | |
| Sep 3 2009 | $20.20 | + | $20.20 | + | $20.20 | - |
| Sep 19 2008 | $14.80 | - | $20.25 | + | $25.96 | + |
| Sep 20 2009 | $16.09 | + | $18.03 | - | $19.00 | - |
| Sep 28 2009 | $17.50 | + | $17.67 | - | $17.80 | - |