Deleting Semi Duplicates

Suppose that I have a table that contains a lot of records that are
identical except for an id field and a date-time-stamp field. For
example

Id Unit Price DTS
1 A 1.00 Date 1
2 A 1.00 Date 2
3 A 1.00 Date 3
4 B 1.25 Date 4
5 B 1.50 Date 5
6 B 1.50 Date 6
7 C 2.75 Date 7
8 C 2.75 Date 8
9 C 2.75 Date 9
10 C 3.00 Date 10

I want to cull out records that are duplicates in the units and price
fields. I want to use the max DTS as the criteria for which record in
a set of "duplicates" will remain. So, If I get the right query, I
should return with

Id Unit Price DTS
1 A 1.00 Date 1
4 B 1.25 Date 4
5 B 1.50 Date 5
7 C 2.75 Date 7
10 C 3.00 Date 10

Is this possible using a single query? If so, how? I am sure that I
can do this using code, but it will involve a bunch of loops and
process time. I would prefer a cleaner, more elegant way. Thanks for
any help.

Jerry