EXHIBIT 99.1

                               JOINT FILING AGREEMENT

        Pursuant to and in accordance with the Securities Exchange Act of 1934,
as amended (the "Exchange Act"), and the rules and regulations thereunder,
each party hereto hereby agrees to the joint filing, on behalf of each of them,
of any filing required by such party under Section 13 or Section 16 of the
Exchange Act or any rule or regulation thereunder (including any amendment,
restatement, supplement, and/or exhibit thereto) with the Securities and
Exchange Commission (and, if such security is registered on a national
securities exchange, also with the exchange), and further agrees to the
filing, furnishing, and/or incorporation by reference of this agreement as an
exhibit thereto. This agreement shall remain in full force and effect until
revoked by any party hereto in a signed writing provided to each other party
hereto, and then only with respect to such revoking party.

        IN WITNESS WHEREOF, each party hereto, being duly authorized, has caused
this agreement to be executed and effective as of the date set forth below.


Date: November 20, 2019                   WELLS FARGO & COMPANY

                                          By: /s/ Patricia Arce
                                             -----------------------------------
                                             Name:  Patricia Arce
                                             Title: Designated Signer


                                          WELLS FARGO MUNICIPAL CAPITAL
                                          STRATEGIES, LLC

                                          By: /s/ Adam Joseph
                                              ----------------------------------
                                              Name:  Adam Joseph
                                              Title:  President



                                          WELLS FARGO BANK, NATIONAL ASSOCIATION

                                          By: /s/ Adam Joseph
                                              ----------------------------------
                                              Name:  Adam Joseph
                                              Title:  Managing Director