diff --git a/devops/observability/grafana/docs/books.txt b/devops/observability/grafana/docs/books.txt
index 604731009..79eb721cf 100644
--- a/devops/observability/grafana/docs/books.txt
+++ b/devops/observability/grafana/docs/books.txt
@@ -2,3 +2,6 @@
 Salituro - Learn Grafana 10.x 2nd ed
     D517AEFBA17B04DC0D83FE84A1542CDD
     107DAAA7EB471FD1B60C11D0E281B6C7
+ChapmanHolmes - Observability with Grafana
+    https://libgen.mx/book/18275072
+    https://libgen.mx/book/17906968
diff --git a/security/crypto/docs/books.txt b/security/crypto/docs/books.txt
new file mode 100644
index 000000000..e7e499eee
--- /dev/null
+++ b/security/crypto/docs/books.txt
@@ -0,0 +1,2 @@
+2024
+NitaMihailescu - Cryptography and Cryptanalysis in Java