Here's the correct order of the call numbers.  Again, note that the third and fourth row are read as decimal numbers!

DN
818
.B6
R37
DN
818
.B72
R35
DN
818
.B8
R37
DN
818
.B8
R52
DN
818
.B8
R7

In this example:

The order of first, second, and third call numbers is determined based on the 3rd row of decimal numbers (.6 < .72 < . 8).
The order of third, forth, and fifth call numbers is determined based on their 4th row of decimal numbers (.37 <  .52 <  .7)