  Elements with weak and blended spectral features in stellar spectra are
challenging to measure and require specialized analysis methods to precisely
measure their chemical abundances. In this work, we have created a catalog of
approximately 120,000 giants with high signal-to-noise APOGEE DR17 spectra, for
which we explore weak and blended species to measure Na, P, S, V, Cu, Ce, and
Nd abundances and $^{12}$C/$^{13}$C isotopic ratios. We employ an updated
version of the BACCHUS (Brussels Automatic Code for Characterizing High
accUracy Spectra) code to derive these abundances using the stellar parameters
measured by APOGEE's DR17 ASPCAP pipeline, quality flagging to identify suspect
spectral lines, and a prescription for upper limits. Combined these allow us to
provide our BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS) catalog
of precise chemical abundances for these weak and blended species that agrees
well with literature and improves upon APOGEE abundances for these elements,
some of which are unable to be measured with APOGEE's current, grid-based
approach without computationally expensive expansions. This new catalog can be
used alongside APOGEE and provide measurements for many scientific applications
ranging from nuclear physics to Galactic chemical evolution and Milky Way
population studies. To illustrate this we show some examples of uses for this
catalog, such as, showing that we observe stars with enhanced s-process
abundances or that we can use the our $^{12}$C/$^{13}$C ratios to explore extra
mixing along the red giant branch.
