May an Indulgence be Obtained Simultaneously for Oneself and for the Souls in Purgatory?

This question relates somewhat to the one posted here: https://christianity.stackexchange.com/questions/107637/are-indulgences-previously-granted-by-popes-still-in-effect-unless-specified-oth The following (which is part of a preparatory prayer for the *Stations of the Cross* devotion) is extracted from pg. 301 of [*Mary, Help of Christians*](https://ia801604.us.archive.org/20/items/MaryHelpOfChristians/MaryHelpOfChristians_text.pdf) I have long been under the impression that an Indulgence can be gained either for oneself or for the souls in Purgatory (but not both). After reading the above, I am not so sure. QUESTION: May an indulgence simultaneously be obtained **both** for oneself and for the souls in Purgatory (if it is not specified that it is applicable only to one or the other---such as, the indulgence associated with visiting a cemetery on All Souls Day.)? Thank you.