There are some occasions where a part spans more than one CFR file, like 26 CFR part 1, 29 CFR part 1910, 40 CFR parts 52, 60, 63, and 86. In these cases, you will not be able to retrieve the entire part by itself. You will get part retrievals for each volume. Similarly, 50 CFR 17.11 spans more than one volume of the CFR. You will not be able to retrieve the entire section by itself.