In 1913, when the first income tax under the 16th Amendment was enacted, the Standard Federal Tax Reporter covered federal income, estate, gift, and excise taxes within a single volume. Today, CCH has other reporters concerned with estate, gift, excise, and other taxes so that the Standard Federal Tax Reporter is now devoted exclusively to the federal income tax. Locate the current edition of the Standard Federal Tax Reporter and very briefly observe the contents of its several volumes. How many volumes are in the current edition of this tax service? (Be sure to count only the volumes of the Standard Federal Tax Reporter‑‑not those of other CCH services.)

a. 10 volumes

b. 16 volumes

c. 19 volumes

d. 25 volumes