Quadrupolar‐broadened NMR spectra were obtained for 0‐17, B‐10, and B‐11 in B2O3glass using samples specially enriched in 0‐17 and B‐10. Lineshape analysis of the 0‐17 spectra indicates the presence of two oxygen sites. Site one has coupling constant Qcc=4.69 MHz and asymmetry parameter &eegr;=0.58, corresponding to oxygen atoms in boroxol rings; site two is characterized by Qcc=5.6 MHz and a large distribution in &eegr; about the value &eegr;=0.2, corresponding to oxygen atoms connecting boroxol rings. From one of the features of the B‐10 spectrum, the distribution of the boron coupling constants is obtained centered about the value Qcc=5.51 MHz (corresponding to Qcc=2.64 MHz for B‐11). A distribution about &eegr;=0.12 is postulated for the boron asymmetry parameter which fits the remainder of the spectrum. These distributions are shown to agree with the B‐11 spectrum.